Several along the way; My Dad w Mac and big Bozaks in 1965, my own work at two high end audio shops. Engaging conversation and discovering w clients who became friends. Online relationship w Charlie Hansen of Ayre, Roger Modjeski of Music Reference and Beveridge! , Joe White, Jim Smith ( not the Maggie guy ), now fast friends w Richard Vandersteen. Cast a wide net, enjoy the music. Always seek out a sensei you can learn from.